Addition of pentavalent impurity to a semiconductor creates many

When a pentavalent impurity is added to a pure semiconductor, it becomes

A

An insulator

B

An intrinsic semiconductor

C

p-type semiconductor

D

n-type semiconductor

Addition of trivalent impurity to a semiconductor creates many

A

Holes

B

Free electrons

C

Valence electrons

D

Bound electrons

A pentavalent impurity has ___________ Valence electrons

A

3

B

5

C

4

D

6

The impurity level in an extrinsic semiconductor is about of pure semiconductor.

A

10 atoms for 108 atoms

B

1 atom for 108 atoms

C

1 atom for 104 atoms

D

1 atom for 100 atoms

As the doping to a pure semiconductor increases, the bulk resistance of the semiconductor ___________

A

Remains the same

B

Increases

C

Decreases

D

None of the above

নিম্নের কোনটি p-টাইপ অর্ধপরিবাহীতে n-টাইপ অর্ধপরিবাহীর তুলনায় বেশি আছে? (Which of the following does a p-type semiconductor have more compared to an n-type semiconductor-)

A

মোট ধনাত্মক আধান (total positive charge)

B

মোট আধান (total charge)

C

ইলেকট্রন ঘনত্ব (density of electrons)

D

হোল ঘনত্ব (density of holes)

A computer takes 50 nanoseconds to do an 221 addition. How many addition can it do in 1 second?

A

20 million

B

25 million

C

30 million

D

35 million

Which of the following impurity in cast iron promotes graphite nodule formation and increases the fluidity of the molten metal?

A

Silicon

B

Sulphur

C

Manganese

D

Phosphorus

By increasing impurity content in the metal alloy the residual resistivity always

A

Decreases

B

Increases

C

Remains constant

D

Becomes temperature independent

The impurity atoms is semiconductors

A

Inject more charge carriers

B

Reduce the energy gap

C

Increase the kinetic energy of valence electrons

D

All of the above

Addition of pentavalent impurity to a semiconductor creates many

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